Kumho Crugen HP91 is a summer tyre made in total of 50 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 285/50 R20 is 70mm wider than the narrowest dimension (215) and -10mm narrower than the widest one (275). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (285mm), which results in 142.5mm sidewall height. In 285/50 R20, there is only one possible speed index for Kumho Crugen HP91 - "V", which is good for speeds up to 240 km/h. In 285/50 R20, Crugen HP91 usually competes against Turanza 6, which is a tyre from Bridgestone with a rating of 77%, compared to 0% of the Kumho in question.